Film Cooling Effectiveness for Injection from Multirow Holes

Sasaki, Masayuki; Takahara, Kitao; Kumagai, T.; Hamano, Masashige

doi:10.1115/1.3446430

Cited by 70 publications

(17 citation statements)

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“…Sellers [1] brought forward a superposition calculation method ignoring the interference between rows of film cooling holes, but it is only suitable for two-dimensional film cooling gaps. Sasaki et al [2] validated the method experimentally. The results show that the calculated value is lower in most cases, but that the deviations are acceptable.…”

Section: Introductionmentioning

confidence: 96%

Investigation of film cooling and superposition method for double row dustpan‐shaped holes

Zhu

Tao

2008

Heat Trans. Asian Res.

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Film cooling effectiveness for injection from single row and double row dustpan-shaped holes was studied experimentally. The difference in cooling performance between single row and double row holes are described. The results show that the optimal blowing ratio of injection from double row holes is higher than that of injection from a single row hole. In the case of higher blowing ratios, the traditional superposition calculation method underpredicts the film cooling effectiveness of the double row injection based on that of the single row hole injection. The modified superposition calculation method is given in this paper.

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Section: Introductionmentioning

confidence: 96%

Investigation of film cooling and superposition method for double row dustpan‐shaped holes

Zhu

Tao

2008

Heat Trans. Asian Res.

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“…A change in static pressure is employed, which is more significant than the ones reported by either Sasaki et al [1] or Scrittore et al [2]. A change in static pressure is employed, which is more significant than the ones reported by either Sasaki et al [1] or Scrittore et al [2].…”

Section: Introductionmentioning

confidence: 99%

“…Of past investigations, only Sasaki et al [1], Scrittore et al [2], and Ligrani et al [3] consider such an arrangement. Of past investigations, only Sasaki et al [1], Scrittore et al [2], and Ligrani et al [3] consider such an arrangement.…”

Section: Introductionmentioning

confidence: 99%

“…For Sasaki et al [1] and Scrittore et al [2], changes in static pressure are produced by increasing freestream velocity which results from the volumetric addition of coolant into constant area ducts, after it leaves the film cooling holes. The configurations employed by Sasaki et al [1], Scrittore et al [2], and Ligrani et al [3] are also different from many other existing film cooling investigations because smaller hole length-to-diameter ratios are employed, along with plenum arrangements for supply of the cooling film. The resulting drops in static pressure along the array lead to increased exit velocity from subsequent rows of holes.…”

Section: Introductionmentioning

confidence: 99%

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Full-Coverage Film Cooling: Heat Transfer Coefficients and Film Effectiveness for a Sparse Hole Array at Different Blowing Ratios and Contraction Ratios

Ligrani

Goodro

Fox³

et al. 2015

Journal of Heat Transfer

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The present experimental investigation considers a full coverage film cooling arrangement with different streamwise static pressure gradients. The film cooling holes in adjacent streamwise rows are staggered with respect to each other, with sharp edges and streamwise inclination angles of 20 deg with respect to the liner surface. Data are provided for turbulent film cooling, contraction ratios of 1 and 4, blowing ratios (BRs) (at the test section entrance) of 2.0, 5.0, and 10.0, a coolant Reynolds number of 12,000, freestream temperatures from 75 C to 115 C, a film hole diameter of 7 mm, and density ratios from 1.15 to 1.25. Nondimensional streamwise and spanwise film cooling hole spacings, X/D and Y/D, are 18 and 5, respectively. Data illustrating the effects of contraction ratio, BR, and streamwise location on local, line-averaged, and spatially averaged adiabatic film effectiveness data; and on local, line-averaged and spatially averaged heat transfer coefficient data are presented. Varying BR values are present along the length of the contraction passage, which contains the cooling hole arrangement, when contraction ratio is 4. Dependence on BR indicates important influences of coolant concentration and distribution. For example, line-averaged and spatially averaged adiabatic effectiveness data show vastly different changes with BR for the configurations with contraction ratios of 1 and 4. In addition, much larger effectiveness alterations are present as BR changes from 2.0 to 10.0, when significant acceleration is present and Cr ¼ 4 (in comparison with the Cr ¼ 1 data).

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“…Generally, these studies focused on the effects of geometric factors and aerothermic factors on the performance of film cooling. Geometric factors involve injection angle [5], arrangement of holes (inline or staggered) [6], hole exit shape [2], inter-holes distance and inter-rows distance [7]. Aerothermic factors consist of blowing ratio [8], turbulence level Tu [9], temperature ratio T j /T∞ [8], density ratio ρ j /ρ∞ [10].…”

Section: Introductionmentioning

confidence: 99%